<template>
  <div class="home-container">
    <!-- 项部导航栏组件 -->
    <van-nav-bar class="page-nav-bar" fixed>
      <van-button
        class="search-btn"
        slot="title"
        type="info"
        size="small"
        round
        icon="search"
        to="/search"
        >搜索</van-button
      >
    </van-nav-bar>
    <!-- 频道列表 -->
    <van-tabs class="channel-tabs" v-model="active" swipeable animated>
      <!-- 频道编辑弹出框 -->
  <van-tab :title="channel.name" v-for="channel in channels" :key="channel.id">
    <!-- 文章列表 -->
    <article-list ref="article-list" :channel="channel" />
</van-tab>
      <!-- <van-tab title="标签 2">内容 2</van-tab>
      <van-tab title="标签 3">内容 3</van-tab>
      <van-tab title="标签 4">内容 4</van-tab>
      <van-tab title="标签 5">内容 5</van-tab>
      <van-tab title="标签 6">内容 6</van-tab> -->
      <!-- 添加占位符充当内容区域，解决最后一个标签被覆盖遮挡的问题 -->
      <div slot="nav-right" class="placeholder"></div>
      <div slot="nav-right" class="hamburger-btn" @click="isChennelEditShow = true">
        <i class="toutiao toutiao-gengduo"></i>
      </div>
    </van-tabs>
    <!-- 频道编辑弹出层 -->
    <van-popup
  v-model="isChennelEditShow"
  closeable
  close-icon-position="top-left"
  position="bottom"
  :style="{ height: '100%' }"
>
<channel-edit :my-channels="channels" :active="active" @update-active="onUpdateActive"

/>
</van-popup>
  </div>
</template>

<script>
import { getUserChannels } from '@/api/user'
import ArticleList from './components/article-list'
import ChannelEdit from './components/channel-edit'
import { mapState } from 'vuex'
import { getItem } from '@/utils/storage'
export default {
  name: 'HomePage',
  components: {
    ArticleList,
    ChannelEdit
  },
  data () {
    return {
      active: 0,
      channels: [], // 频道列表
      isChennelEditShow: false // 控制编辑频道弹出层的显示状态
    }
  },
  computed: {
    ...mapState(['user'])
  },
  created () {
    this.loadChannels()
  },
  methods: {
    async loadChannels () {
      try {
        // const { data } = await getUserChannels()
        // this.channels = data.data.channels
        let channels = []
        if (this.user) {
        // 已登录，请求获取用户频道列表
          const { data } = await getUserChannels()
          channels = data.data.channels
        } else {
        // 未登录，判断是否有本地的频道列表数据
          const localChannels = getItem('TOUTIAO_CHANNELS')
          if (localChannels) {
          // 有，拿来使用
            channels = localChannels
          } else {
          // 没有，请求获取默认频道列表
            const { data } = await getUserChannels()
            channels = data.data.channels
          }
        }
        this.channels = channels
      } catch (err) {
        this.$toast('获取频道数据失败')
      }
    },
    onUpdateActive (index, isChennelEditShow = true) {
      // console.log('home', index)
      // 更新激活的频道项
      this.active = index

      // 关闭编辑频道弹层
      this.isChennelEditShow = isChennelEditShow
    }
  }
}

</script>

<style lang="less" scoped>
// scoped的作用是限制样式只在当前组件有效
.article-list {
  height: 79vh;
  overflow-y: auto;
}
.home-container {
padding-bottom: 100px;
padding-top: 174px;
  /deep/ .van-nav-bar__title {
    max-width: unset;
  }
  .search-btn {
    width: 555px;
    height: 64px;
    background-color: #5babfb;
    border: none;
    font-size: 28px;
    .van-icon {
      font-size: 32px;
    }
  }
  /deep/ .channel-tabs {
    .van-tabs__wrap {
      position: fixed;
    top: 92px;
    z-index: 1;
    left: 0;
    right: 0;
    height: 82px;
    }

    .van-tab {
      min-width: 200px;
      border-right: 1px solid #edeff3;
      font-size: 30px;
      color: #777777;
    }

    .van-tab--active {
      color: #333333;
    }

    .van-tabs__nav {
      padding-bottom: 0;
    }

    .van-tabs__line {
      bottom: 8px;
      width: 31px !important;
      height: 6px;
      background-color: #3296fa;
    }
  }
  .placeholder {
    flex-shrink: 0;
    width: 66px;
    height: 82px;
  }
  .hamburger-btn {
    position: fixed;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 66px;
    height: 82px;
    background-color: #fff;
    opacity: 0.902;

    i.toutiao {
      font-size: 33px;
      color: gold;
    }
    &:before {
      content: '';
      position: absolute;
      left: 0;
      width: 1px;
      height: 100%;
      background-image: url(@/assets/gradient-gray-line.png);
      background-size: contain;
    }
  }
}
</style>
